9988631 has 8 divisors (see below), whose sum is σ = 10362144. Its totient is φ = 9620640.

The previous prime is 9988609. The next prime is 9988633. The reversal of 9988631 is 1368899.

9988631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9988631 - 2¹⁸ = 9726487 is a prime.

It is a super-2 number, since 2×9988631² = 199545498508322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2501 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (1295268).

Almost surely, 2^9988631 is an apocalyptic number.

9988631 is a deficient number, since it is larger than the sum of its proper divisors (373513).

9988631 is a wasteful number, since it uses less digits than its factorization.

9988631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761.

The product of its digits is 93312, while the sum is 44.

The square root of 9988631 is about 3160.4795522199. The cubic root of 9988631 is about 215.3617921493.

The spelling of 9988631 in words is "nine million, nine hundred eighty-eight thousand, six hundred thirty-one".